What design method includes the use of internal braces for stress distribution on wings during flight?

The correct answer, which involves the use of internal braces for effective stress distribution on wings during flight, is the semimonocoque design. This method is an evolution of the traditional monocoque design and enhances structural integrity while minimizing weight.

In a semimonocoque structure, the skin of the aircraft plays a significant role in carrying loads, but it is supplemented by internal components such as ribs and stringers. These additional elements provide support and help distribute stresses more evenly throughout the structure, particularly in the wings where aerodynamic forces are significant. The combination of the skin and the internal braces ensures that the wings can endure the complex forces encountered during flight, such as lift and turbulence.

In contrast, the monocoque design relies heavily on the outer skin itself to provide structural strength, which can lead to limitations in load capacity compared to the semimonocoque approach. While hydraulic design refers to systems utilizing fluid power, and truss design typically involves a framework of interconnected beams, they do not incorporate the internal bracing method essential for effective stress distribution in wings as seen in the semimonocoque design.